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  • 电脑安装openSUSE42.3 Ubuntu16.04 双系统,当电脑插上网线后开机会出现A start job is running for Network Manager wait online (29s / no limit) 等待30S时间的提示,不插网线不会出现,通过网上查资料实验...

    电脑安装openSUSE42.3和 Ubuntu16.04 双系统,当电脑插上网线后开机会出现A start job is running for Network Manager wait online (29s / no limit) 等待30S时间的提示,不插网线不会出现,
    通过网上查资料和实验得出结论应该是:
    通过Network Manager来管理网络后有线网络通过DHCP获取网络地址,这样当插上有线网络开机后会在线等待获取IP地址,等待时间是30s,解决办法是关闭Network Manager wait online这个服务或把在线等待时间改为更短的时间,关闭这种方法我没有实验,因为有些服务可能依赖这个服务,关闭后可能存在莫名的错误。

    1、Ubuntu16.04更改在线等待时间:
    找到NetworkManager-wait-online.servic这个文件,Ubuntu下文件在/lib/systemd/system目录下

    查看这个文件:
    pipci@ubuntu:/lib/systemd/system$ cat NetworkManager-wait-online.service
    [Unit]
    Description=Network Manager Wait Online
    Documentation=man:nm-online(1)
    Requisite=NetworkManager.service
    After=NetworkManager.service
    Before=network-online.target

    [Service]
    Type=oneshot
    ExecStart=/usr/bin/nm-online -s -q --timeout=30
    RemainAfterExit=yes

    [Install]
    WantedBy=network-online.target
    pipci@ubuntu:/lib/systemd/system$

    这个文件里的ExecStart=/usr/bin/nm-online -s -q --timeout=30 这行--timeout=30 是等待30s 通过vi编辑器
    把这行给成ExecStart=/usr/bin/nm-online -s -q --timeout=5 保存,等待时间变成5s

     

    2、openSUSE42.3更改在线等待时间:

    找到NetworkManager-wait-online.servic这个文件,openSUSE下文件在/usr/lib/systemd/system/目录下

    查看这个文件:
    pipci@openSUSE:/usr/lib/systemd/system> cat NetworkManager-wait-online.service
    [Unit]
    Description=Network Manager Wait Online
    Requisite=NetworkManager.service
    After=NetworkManager.service
    Wants=network.target
    Before=network.target network-online.target

    [Service]
    Type=oneshot
    Environment=NM_ONLINE_TIMEOUT=0
    EnvironmentFile=-/etc/sysconfig/network/config
    ExecStart=/bin/bash -c "if [ ${NM_ONLINE_TIMEOUT} -gt 0 ]; then /usr/bin/nm-online -s -q --timeout=${NM_ONLINE_TIMEOUT} ; else /bin/true ; fi"

    [Install]
    WantedBy=multi-user.target
    pipci@openSUSE:/usr/lib/systemd/system>

    这个文件里的timeout=${NM_ONLINE_TIMEOUT}是等待时间,但是不能在这个文件里直接更改,通过上面的文件可以知道配置文件是/etc/sysconfig/network/config 这个文件

    查看/etc/sysconfig/network/config文件,文件里面有行NM_ONLINE_TIMEOUT="30"这个选项,通过vi把这行改成NM_ONLINE_TIMEOUT="5"保存,这样等待时间就会缩短成5S,开机时间快了很多。

    转载于:https://www.cnblogs.com/pipci/p/8527191.html

    展开全文
  • for update 功能(锁住表锁住符合条件的行) select * from TTable1 for update 锁定表的所有行,只能读不能写 select * from TTable1 where pkid = 1 for update 只锁定pkid=1的行 select * from Table1 a join ...

    一、for update 功能(锁住表和锁住符合条件的行)

    1. select * from TTable1 for update 锁定表的所有行,只能读不能写
    2. select * from TTable1 where pkid = 1 for update 只锁定pkid=1的行
    3. select * from Table1 a join Table2 b on a.pkid=b.pkid for update 锁定两个表的所有记录
    4. select * from Table1 a join Table2 b on a.pkid=b.pkid where a.pkid = 10 for update 锁定两个表的中满足条件的行
    5. select * from Table1 a join Table2 b on a.pkid=b.pkid where a.pkid = 10 for update of a.pkid 只锁定Table1中满足条件的行
      for update 是把所有的表都锁点 for update of 根据of 后表的条件锁定相对应的表

    二、for update 和 for update nowait区别(前者阻塞其他事务,后者拒绝其他事务)

    for update锁住表或者锁住行,只允许当前事务进行操作(读写),其他事务被阻塞,直到当前事务提交或者回滚,被阻塞的事务自动执行
    for update nowait 锁住表或者锁住行,只允许当前事务进行操作(读写),其他事务被拒绝,事务占据的statement连接也会被断开

    展开全文
  • // The standard idiom for calling the wait method in Java synchronized (sharedObject) { while (condition) { sharedObject.wait(); // (Releases lock, and reacquires on wakeu...
    // The standard idiom for calling the wait method in Java 
    synchronized (sharedObject) { 
        while (condition) {
            sharedObject.wait(); 
            // (Releases lock, and reacquires on wakeup) 
        } 
        // do action based upon condition e.g. take or put into queue 
    } 

    ⑤多线程中测试某个条件的变化用 if 还是用 while?

    说是要把if换成while的理由,应该是wait线程被唤醒之后,会继续从wait那里往下面执行,如果是if的话,就会直接往下面执行,不会再判断if的状态了;但是如果是while的话,从wait那里往下面执行,然后还会判断while中的条件,如果==0的话,还是会继续阻塞,如果是>0,则会执行while语句块外面的remove吧?!其中关键就是被notify唤醒之后,是否会执行条件判断

     

    http://www.cnblogs.com/hapjin/p/5492645.html

     

    转载于:https://www.cnblogs.com/H-BolinBlog/p/6911075.html

    展开全文
  • 4 tips for staying productive on Friday如何让你的周五周一一样有效率1.Schedule Your Day with Tasks 用任务计划一天 Sometimes the to-do list seems less urgent on a Friday. (‘It can wait until next...

       

    4 tips for staying productive on Friday
    如何让你的周五和周一一样有效率
    1.Schedule Your Day with Tasks

    用任务计划一天

    Sometimes the to-do list seems less urgent on a Friday. (‘It can wait until next week.’) While that may be true, do you really want to start your Mondays already behind? To combat this mindset,schedule a meeting with your work.

    有时候任务表在周五看起来不那么紧急。(我可以等到下周再做。)尽管是这样没错,但你真的想在下周一开始就落后么?为了打破这种思维,好好的计划一下你要处理的工作吧。

    First, write down everything that needs to be done, in order of importance. This frees up your mind from being cluttered,confused, or disorganized (especially important on a Friday).

    首先,按重要程度写下所有你需要干的活。这样你的思路就不会混乱、疑惑。(周五列任务清单尤其重要。)

    If anything on that list takes longer than a few hours, break it down into mini-tasks that can get done within a shorter time frame. This keeps work from appearing overwhelming. Next, put a circle or empty check box next to the top three things to get done, along with a time frame or deadline. This focuses your attention on to one thing at a time, which is the key to personal productivity.

    如果清单上面的任何一个任务需要花费几个小时,不如分解成一个个的小任务,再以更短的时间一项项完成。这样能让你的工作看起来不那么铺天盖地。接下来,在最首要的三件事旁画个圈或是一个方框,写上完成时间范围或最后期限。这能让你的注意力一次集中在一件事情上,对个人的效率至关重要。

    2.Schedule Breaks

    打破计划

    If the office is much quieter on a Friday than on a Monday, you may not get interrupted at all. While that sounds great,it also means the day can feel long, you might be more prone to procrastinating, or you find it difficult to concentrate and focus after a few hours of intense independent work. To combat that, schedule breaks. I wouldn’t set an alarm, but if you find yourself looking at the clock, give yourself structured work time and structured play time in an interval format to get you through the day. In the end, it will be more productive than attempting to exert your willpower 100% evenly. For example:

    如果比起周一,周五办公室要安静许多,你可以完全不受打扰。尽管这听起来很不错,但也意味着这一天似乎更加漫长一点,你也许拖延症会加剧,或者发现自己在几个小时的独立紧张工作之后难以集中注意力了。想改善这个情况?那就打破你的计划吧。我不会设一个闹钟,但如果你发现自己会时不时看时间,给自己一个规划好的工作时间和玩乐时间,让自己熬过这一天吧。最后你会发现比起付出百分百的努力,这样做你的效率会高出很多。举个例子:

    90 minute work effort followed by a 20 minute break [word processing],60 minute work effort followed by a 15 minute break [Power Points],20 minute work effort followed by a 5 minute break [spreadsheets]

    工作90分钟之后休息20分钟【文字处理】,工作60分钟之后休息15分钟【PPT】,工作20分钟 之后休息5分钟【表格处理】

    3.Change Your Script

    改变思维想法

    If instead of distracting yourself away from negativity, you refocused with positive thoughts about your workweek, how much more productive could you be?

    与其让自己一直被消极所干扰,不如转念关注那些有关工作周的积极想法,你还能再有效率多少?

    What if instead of thinking or saying:“I need a weekend to recover from my weekend,” on Monday;“Hump day/halfway there” on Wednesday;“I can’t wait to get out of here and start my weekend,” on Friday…

    与其说:周一说“我还需要一个周末才能从上个周末中恢复过来”;周三说“一半过去了”;周五说“我真是等不及离开这里去过周末了”……

    We approached the days with:“Let’s get this week off to a good start,” on Monday;“Look at what I accomplished this week already and here’s what I will get done today,” on Wednesday;“Here are the three things I absolutely want to accomplish before I start my weekend,” on Friday.

    我们不妨这样度过每一天:周一说“干起来,新的一周要有个好的开始”;周三说“看看我这周都完成了先什么,我今天要完成这些”;周五说“周末开始之前还有三件非常重要的事需要解决”。

    4.Compress Your Workweek

    压缩工作时间

    Finally, if all else fails, use a work around. Pretend Friday doesn’t exist. Start each week thinking you only have Monday-Thursday to get everything done and then act on that. This will improve your productivity throughout the whole week, and then Friday can be catch-up day, a strategic work day, a day to schedule your meetings, or a day to take it easy (without guilt). Along those lines, you can rearrange your week in a way that leaves easy or mindless things to be done on Friday (though easy and mindless differs for everyone, examples might be filing, documenting,planning, or updating).

     最后,如果一切都失败了,使用变通方法。假装周五不存在。开始每星期在想你只有周一至周四来完成这一切,然后采取行动这一点。这将提高您的工作效率在整个星期,然后周五可以赶上的一天,一个战略性工作一天,每天安排您的会议或一天慢慢来(没有罪恶感) 。沿着这些线路,您可以在本周重新排列的方式,离开容易,或盲目的事情要在周五完成(虽然简单,盲目的不同给大家,例子可能是存档,文档化,规划或更新) 。

    转载于:https://www.cnblogs.com/kingshow123/p/fridayandmonday.html

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  • Also, it will on occasion reuse the WaitGroup before the Wait has returned. <p>I don't like to be the person to ask to be spoon-fed code, but I am at a loss as to how to implement this. There seems ...
  • 通过“等待(超时)”调用所花费的“用户时间”或“挂钟时间”通常是超时值加上线程重新调度执行执行之前的时间.The thread T is then […] re-enabled for thread scheduling. It then competes in the usual ...
  • 先看看官方文档对于这两个参数的定义interactive_timeout默认是28800,单位秒,即8个小时The number of seconds the server waits for activity on an interactive connection before closing it. An interactive ...
  • 水平有限,如果有误请指出源码版本:percona 5.7.22 一、参数意思 ...interactive_timeout:The number of seconds the server waits for activity on an interactive connection before closing An ...
  • 水平有限,如果有误请指出源码版本:percona 5.7.22一、参数意思这里简单解释一下两个参数含义如下:interactive_timeout:The number of seconds the server waits for activity on an interactive connection ...
  • // defer wg.Done here will give negative waitgroup panic, commenting it will give negative waitgroup counter panic fd, err := os.Open(dir) if err != nil { panic(err) } filenames, err := fd....
  • 一、参数意思 ...interactive_timeout:The number of seconds the server waits for activity on an interactive connection before closing it. An interactive client is defined as a cli...
  • 水平有限,如果有误请指出源码版本:percona 5.7.22 一、参数意思 ...interactive_timeout:The number of seconds the server waits for activity on an interactive connection before closing An ...
  • 水平有限,如果有误请指出源码版本:percona 5.7.22一、参数意思这里简单解释一下两个参数含义如下:interactive_timeout:The number of seconds the server waits for activity on an interactive connection ...
  • 如上图,突然出现这个问题,解决问题办法 1. NetworkManager 服务有冲突,这个好...2.设定开机启动一个名为NetworkManager-wait-online服务, 命令为: systemctl enable NetworkManager-wait-online.service 3..
  • 对于AlwaysOn和镜像环境下的归档(或其他大事务操作),我觉得要注意点:1. 尽量避免在同步模式下做大事务操作,一旦决定做,请改成异步模式。2. 归档勤做,每次做也要loop delete top n and waitfor。3. 索引维护,...
  • depends_on option: it will start services in dependency order, but won't wait for the dependent service to be ready.wait script: wait-for-it recommended by Docker's Controlling startup order in Compos...
  • depends_on option: it will start services in dependency order, but won't wait for the dependent service to be ready.wait script: wait-for-it recommended by Docker's Controlling startup order in Compos...
  • <p>For background, I want to have a goroutine that accepts for messages over a channel and forwards them over a socket connection (...while simultaneously waiting for replies on the socket connection....
  • 一:如何通过adb打开关闭飞行模式 打开飞行模式脚本 @echo off sadb root sadb wait-for-device sadb remount sadb wait-for-device sadb shell settings put global airplane_mode_on 1 sadb shell am ...
  • 嵌套管程锁死是如何发生的 嵌套管程锁死的问题类似于死锁。...Thread 1 decides to wait for a signal from another thread before continuing Thread 1 calls B.wait() thereby releasing the lock on B,
  • I want to handle messages and block on a loop, and it appears that delegating the closing of the channel to another go routine seems to be a weird solution? <pre><code>func Crawl(url string, depth ...
  • laravel5.2.15Laracon is almost upon us. Unfortunately for me, I will not be able to ... Guess, I'll have to wait for a couple of months to watch it on Youtube. That aside, this year's Laracon will...
  • 最终流程子流程

    2017-10-19 12:56:06
    <p>Once I send the <code>Kill</code> signal, I call <code>c.Wait()</code> to wait for the current command to end before starting a new command. <p><strong>The Problem</strong> is that the first ...
  • 看了有关这个问题的几篇博文,几乎都是引用了stackoverflow上的一个回答;问题: I know that a fragment’s view hierarchy has to be inflated in onCreateView, but what other ... what should wait for on
  • are commonly controlled by an attacker with the help of a central server: all compromised machines connect to the central server and wait for commands. However, the first botnets that use peer-to-...
  • 异步API回调

    2015-06-18 09:51:13
    I guess I can use some Ajax and make the async service sending data to the same page and wait for the response on this page. <p>I guess I wrote very hard because I can't fully explain what I need, ...

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